I wouldn't be surprised if we end up with another scandal involving all this. It's no wonder there is such a backlog now of people - both EU and non-EU.
Ceremony fees are now part of the application fee so shouldn't be extra on top (it would probably help if the fee structures didn't change all the time, but they've already openly admitting the service is running for profit).
I'm currently in the backlog for citizenship ceremonies - just got a call earlier today that they've all my paperwork for it, but things are suspended (thankfully the previous 3 month deadline has been extended too) but it'll likely be another 3-4 weeks. For me, the main issue was more all the proof. It was a big issue when BRPs came in for non-EU residents - I had to prove 15 years of residency, back to when I got indefinite leave to remain (which was when I was meant to be done with this shit being required). It was really hard for many who had arrived on spousal or other family visas and had time not working either through caring responsibilities or ill health as the paperwork allowed can be quite strict. Some lost their ability to work or access services - it's hard to feel your place is home when they can pull that out from under you at any moment because they want to prove they're hard on immigrants (for me, my family is my home - that we're in the UK doesn't make me feel more at home here much of the time). They've been slightly kinder to EU citizens now getting shove into this mess not having to prove the whole time period, but it's not easy for many people - especially with the push to go paperless.
I had to get through that to take the Life in the UK test before I could then apply for citizenship.
And the 'references' section - like you're already making me agree to a background checks, how are two random people, one who fits the out of date professional criteria, filling in a piece of paper with my picture stuck to it in any way proving my good character. No one makes you do that for a DBS check. That and the "private partners" charging £60+ to scan documents, but really it's library staff with little training using the company's scanners and finger scan equipment that's been bodged in.
I can see why people find going for citizenship off-putting even if your other citizenships don't cause an issue for it, it's seems to be both intentionally designed that way with many unintentional consequences as most of the changes seem to focus on new arrivals with little thought for those who've been here a while.